302 lines
12 KiB
Python
302 lines
12 KiB
Python
import os
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import sys
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from optparse import OptionParser
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from imp import find_module
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import django
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from django.core.management.base import BaseCommand, CommandError, handle_default_options
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# For backwards compatibility: get_version() used to be in this module.
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get_version = django.get_version
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# A cache of loaded commands, so that call_command
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# doesn't have to reload every time it's called.
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_commands = None
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def find_commands(management_dir):
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"""
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Given a path to a management directory, returns a list of all the command
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names that are available.
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Returns an empty list if no commands are defined.
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"""
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command_dir = os.path.join(management_dir, 'commands')
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try:
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return [f[:-3] for f in os.listdir(command_dir)
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if not f.startswith('_') and f.endswith('.py')]
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except OSError:
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return []
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def find_management_module(app_name):
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"""
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Determines the path to the management module for the given app_name,
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without actually importing the application or the management module.
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Raises ImportError if the management module cannot be found for any reason.
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"""
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parts = app_name.split('.')
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parts.append('management')
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parts.reverse()
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path = None
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while parts:
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part = parts.pop()
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f, path, descr = find_module(part, path and [path] or None)
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return path
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def load_command_class(app_name, name):
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"""
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Given a command name and an application name, returns the Command
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class instance. All errors raised by the import process
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(ImportError, AttributeError) are allowed to propagate.
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"""
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return getattr(__import__('%s.management.commands.%s' % (app_name, name),
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{}, {}, ['Command']), 'Command')()
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def get_commands(load_user_commands=True, project_directory=None):
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"""
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Returns a dictionary mapping command names to their callback applications.
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This works by looking for a management.commands package in django.core, and
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in each installed application -- if a commands package exists, all commands
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in that package are registered.
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Core commands are always included. If a settings module has been
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specified, user-defined commands will also be included, the
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startproject command will be disabled, and the startapp command
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will be modified to use the directory in which that module appears.
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The dictionary is in the format {command_name: app_name}. Key-value
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pairs from this dictionary can then be used in calls to
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load_command_class(app_name, command_name)
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If a specific version of a command must be loaded (e.g., with the
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startapp command), the instantiated module can be placed in the
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dictionary in place of the application name.
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The dictionary is cached on the first call and reused on subsequent
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calls.
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"""
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global _commands
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if _commands is None:
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_commands = dict([(name, 'django.core') for name in find_commands(__path__[0])])
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if load_user_commands:
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# Get commands from all installed apps.
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from django.conf import settings
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for app_name in settings.INSTALLED_APPS:
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try:
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path = find_management_module(app_name)
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_commands.update(dict([(name, app_name) for name in find_commands(path)]))
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except ImportError:
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pass # No management module -- ignore this app.
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if project_directory:
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# Remove the "startproject" command from self.commands, because
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# that's a django-admin.py command, not a manage.py command.
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del _commands['startproject']
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# Override the startapp command so that it always uses the
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# project_directory, not the current working directory
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# (which is default).
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from django.core.management.commands.startapp import ProjectCommand
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_commands['startapp'] = ProjectCommand(project_directory)
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return _commands
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def call_command(name, *args, **options):
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"""
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Calls the given command, with the given options and args/kwargs.
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This is the primary API you should use for calling specific commands.
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Some examples:
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call_command('syncdb')
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call_command('shell', plain=True)
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call_command('sqlall', 'myapp')
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"""
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try:
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app_name = get_commands()[name]
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if isinstance(app_name, BaseCommand):
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# If the command is already loaded, use it directly.
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klass = app_name
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else:
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klass = load_command_class(app_name, name)
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except KeyError:
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raise CommandError, "Unknown command: %r" % name
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return klass.execute(*args, **options)
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class LaxOptionParser(OptionParser):
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"""
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An option parser that doesn't raise any errors on unknown options.
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This is needed because the --settings and --pythonpath options affect
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the commands (and thus the options) that are available to the user.
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"""
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def error(self, msg):
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pass
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def _process_args(self, largs, rargs, values):
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"""
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Overrides OptionParser._process_args to exclusively handle default
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options and ignore args and other options.
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This overrides the behavior of the super class, which stop parsing
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at the first unrecognized option.
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"""
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while rargs:
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arg = rargs[0]
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try:
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if arg[0:2] == "--" and len(arg) > 2:
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# process a single long option (possibly with value(s))
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# the superclass code pops the arg off rargs
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self._process_long_opt(rargs, values)
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elif arg[:1] == "-" and len(arg) > 1:
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# process a cluster of short options (possibly with
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# value(s) for the last one only)
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# the superclass code pops the arg off rargs
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self._process_short_opts(rargs, values)
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else:
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# it's either a non-default option or an arg
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# either way, add it to the args list so we can keep
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# dealing with options
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del rargs[0]
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raise error
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except:
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largs.append(arg)
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class ManagementUtility(object):
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"""
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Encapsulates the logic of the django-admin.py and manage.py utilities.
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A ManagementUtility has a number of commands, which can be manipulated
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by editing the self.commands dictionary.
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"""
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def __init__(self, argv=None):
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self.argv = argv or sys.argv[:]
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self.prog_name = os.path.basename(self.argv[0])
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self.project_directory = None
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self.user_commands = False
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def main_help_text(self):
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"""
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Returns the script's main help text, as a string.
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"""
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usage = ['%s <subcommand> [options] [args]' % self.prog_name]
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usage.append('Django command line tool, version %s' % django.get_version())
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usage.append("Type '%s help <subcommand>' for help on a specific subcommand." % self.prog_name)
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usage.append('Available subcommands:')
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commands = get_commands(self.user_commands, self.project_directory).keys()
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commands.sort()
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for cmd in commands:
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usage.append(' %s' % cmd)
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return '\n'.join(usage)
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def fetch_command(self, subcommand):
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"""
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Tries to fetch the given subcommand, printing a message with the
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appropriate command called from the command line (usually
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"django-admin.py" or "manage.py") if it can't be found.
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"""
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try:
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app_name = get_commands(self.user_commands, self.project_directory)[subcommand]
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if isinstance(app_name, BaseCommand):
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# If the command is already loaded, use it directly.
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klass = app_name
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else:
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klass = load_command_class(app_name, subcommand)
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except KeyError:
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sys.stderr.write("Unknown command: %r\nType '%s help' for usage.\n" % \
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(subcommand, self.prog_name))
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sys.exit(1)
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return klass
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def execute(self):
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"""
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Given the command-line arguments, this figures out which subcommand is
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being run, creates a parser appropriate to that command, and runs it.
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"""
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# Preprocess options to extract --settings and --pythonpath.
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# These options could affect the commands that are available, so they
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# must be processed early.
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parser = LaxOptionParser(version=get_version(), option_list=BaseCommand.option_list)
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try:
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options, args = parser.parse_args(self.argv)
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handle_default_options(options)
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except:
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pass # Ignore any option errors at this point.
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try:
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subcommand = self.argv[1]
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except IndexError:
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sys.stderr.write("Type '%s help' for usage.\n" % self.prog_name)
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sys.exit(1)
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if subcommand == 'help':
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if len(args) > 2:
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self.fetch_command(args[2]).print_help(self.prog_name, args[2])
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else:
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sys.stderr.write(self.main_help_text() + '\n')
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sys.exit(1)
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# Special-cases: We want 'django-admin.py --version' and
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# 'django-admin.py --help' to work, for backwards compatibility.
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elif self.argv[1:] == ['--version']:
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# LaxOptionParser already takes care of printing the version.
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pass
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elif self.argv[1:] == ['--help']:
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sys.stderr.write(self.main_help_text() + '\n')
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else:
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self.fetch_command(subcommand).run_from_argv(self.argv)
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class ProjectManagementUtility(ManagementUtility):
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"""
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A ManagementUtility that is specific to a particular Django project.
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As such, its commands are slightly different than those of its parent
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class.
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In practice, this class represents manage.py, whereas ManagementUtility
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represents django-admin.py.
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"""
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def __init__(self, argv, project_directory):
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super(ProjectManagementUtility, self).__init__(argv)
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self.project_directory = project_directory
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self.user_commands = True
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def setup_environ(settings_mod):
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"""
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Configures the runtime environment. This can also be used by external
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scripts wanting to set up a similar environment to manage.py.
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Returns the project directory (assuming the passed settings module is
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directly in the project directory).
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"""
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# Add this project to sys.path so that it's importable in the conventional
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# way. For example, if this file (manage.py) lives in a directory
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# "myproject", this code would add "/path/to/myproject" to sys.path.
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project_directory, settings_filename = os.path.split(settings_mod.__file__)
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if project_directory == os.curdir or not project_directory:
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project_directory = os.getcwd()
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project_name = os.path.basename(project_directory)
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settings_name = os.path.splitext(settings_filename)[0]
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sys.path.append(os.path.join(project_directory, os.pardir))
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project_module = __import__(project_name, {}, {}, [''])
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sys.path.pop()
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# Set DJANGO_SETTINGS_MODULE appropriately.
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os.environ['DJANGO_SETTINGS_MODULE'] = '%s.%s' % (project_name, settings_name)
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return project_directory
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def execute_from_command_line(argv=None):
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"""
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A simple method that runs a ManagementUtility.
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"""
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utility = ManagementUtility(argv)
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utility.execute()
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def execute_manager(settings_mod, argv=None):
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"""
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Like execute_from_command_line(), but for use by manage.py, a
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project-specific django-admin.py utility.
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"""
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project_directory = setup_environ(settings_mod)
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utility = ProjectManagementUtility(argv, project_directory)
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utility.execute()
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